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1A5G

Sensibly equivalent to:
CV755
    
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The 1A5G is a dry cell audio output pentode with a maximum output of 0.1 Watts.
Electrically the Loctal 1LA4 is identical and a late 1940s re-design of this valve.
The anode is left bright and is cylindrical.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 70 mm tall.
References: Datasheet & 1040. Type 1A5G was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
f+
a
g2
g1
-
f-,g3
-

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rl
Pout
D
1.4
0.05
90
90
-4.5
4.0
1.1
0.3M
0.85
25,000
115mW
7%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December07, 2018.
shape:wide.glass.tube construction:pinch type:pentode age:1940.1950 base:io heater:1.4v pins:8 pin:1.- pin:2.f+ pin:3.a pin:4.g2 pin:5.g1 pin:6.- pin:7.f-.g3 pin:8.-
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